<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    var num = Math.random() * 89 + 10;
    var first = Math.round(num);
    var second = first % 2;
    // console.log(second);
    if(second == 1){
        document.write(first + "是奇数");
    }else{
        document.write(first + "是偶数");
    }
</script>
</html>